Blast cap type ammonia injection and mixing device for selective catalytic reduction denitration

Abstract

The invention provides a blast cap type ammonia injection and mixing device for selective catalytic reduction denitration. The device comprises a first-stage pipe (1), reactor walls (10) and at least three ammonia injection pipes which are arranged at the same intervals. Each of the ammonia injection pipes comprises at least three second-stage pipes (2), third-stage pipes (3), abrasion-proof plugs (4), abrasion-proof angle steels (11), a sealing box (7), a heat insulation cotton (8) and a regulating valve (9), wherein the sealing box (7) is arranged between the reactor wall (10) and the first-stage pipe (1), the heat insulation cotton (8) is placed inside the sealing box (7), the regulating valve (9) is installed between the sealing box (7) and the first-stage pipe (1), the second-stage pipes (2) are arranged at the same intervals, the three-stage pipes (3) are arranged between the two adjacent second-stage pipes (2), one ends of the three-stage pipes (3) are connected with the second-stage pipes (2), and the other ends are connected with the abrasion-proof plugs (4). The device combines an ammonia injection device with a mixing device, evenly mixing of ammonia and smoke on small scales is achieved, the structure is simple, and the device is convenient to manufacture, assemble and disassemble.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and particularly relates to a hood-type Selective Catalytic Reduction (Selective Catalytic Reduction, SCR) denitrification ammonia injection mixing device, which has better mixing performance and simpler operation than conventional ammonia injection / mixing devices. structure. Background technique [0002] Nitrogen oxides (NOx) are one of the major air pollutants. my country's annual NOx emissions show a rapid growth trend. At present, my country is the world's largest NOx emitter, and the environmental capacity of nitrogen oxides is basically saturated. my country's coal-based energy structure and power generation structure determine that coal-fired power stations are the largest source of NOx emissions. As environmental issues have been paid more and more attention, the NOx emission standards for thermal power plants have become increasingly stringent in recent years. The "Emis...

AI Technical Summary

Problems solved by technology

[0006]Technical problem: the present invention aims at the combination of ammonia injection grid + static mixer in the existing SCR system, which makes the overall structure complex and the mixing effect of ammonia injection Unsatisfactory and difficult to achieve uniform flow injection and other technical problems, a hood-type selective catalytic reduction denitrification ammonia injection mixing device is proposed

Images